print(2420220065)
print("24大数据1班温嘉怡")
a = int(input("请输入一个值"))
def jieCheng(a):
    if a==0 or a ==1:
        return 1
    return a*jieCheng(a-1)
result = jieCheng(a)
print(f"{a}的阶乘是{result}")
